Agartala, March 3 :     Two persons, including an Assam Rifles jawan, were killed and three kidnapped by tribal militants in the state since yesterday. The police said five National Liberation Front of Tripura (NLFT) activists were arrested and one killed in separate incidents. A group of Assam Rifles jawans posted in Tulsikhar in the Kalyanpur police station area had gone to meet a ?source? in Panchatibati village. Suspected All-Tripura Tiger Force militants hiding in the jungles fired from AK-56 rifles, killing Lance Naik Gobind Singh Mehta, 32, on the spot. His two colleagues escaped unhurt. No one has been arrested yet. In a separate incident at Daspara village in the Taidu police station area of Amarpur sub-division, a farmer, Rasaranjan Das, was shot dead while he was cutting grass. Sources said tribal militants raided an office in Nalkata in North Tripura and kidnapped an employee, Subhasis Pal. Two other employees of the same office are yet to be traced. Militants kidnapped a schoolboy, Biplab Roy (14), from Akshay Tilla in Amarpur subdivision of South Tripura district last night. In another incident, militants kidnapped fisherman Biswambhar Das, 43, from Gandacherra subdivision yesterday. Assam Rifles jawans shot dead tribal militant Dubajay Reang, 25, in an encounter at Panchari village in the Natun Bazar police station area of South Tripura this morning. Police said a group of Assam Rifles jawans went into Panchari village looking for an abducted youth, Babul Das. On their way back, the jawans exchanged fire with the militants, killing Reang on the spot. A pistol was recovered from the dead militant. No casualties were reported during an encounter between the security forces and the militants in the Baikhora police station area. Meanwhile, the Tripura Upajati Juba Samity (TUJS), an alliance partner of the Congress, has demanded the immediate imposition of President?s rule in Tripura, pleading total breakdown of constitutional machinery. A delegation of TUJS leaders, headed by the party general secretary Rabindra Debbarma, met Prime Minister Atal Behari Vajpayee on Monday and presented him a memorandum, mentioning their demand. The TUJS has also demanded a separate state.